43, 45 Portman Square Westminster W1H 6LY
Amendments to planning permission dated 22nd April 2026 (RN:25/06153/FULL) for: Variation of Condition 1 of planning permission dated 7th April 2025 (RN: 24/04987/FULL) for: Partial demolition of the existing roof and removal of plant equipment; construction of a roof extension providing new office (Class E) floorspace with associated external amenity spaces and plant equipment; refurbishment of the existing building, including infilling of the existing atrium; alterations to the existing façade; provision of cycle parking spaces and end of journey facilities, and all associated and ancillary works namely, amendments to mansard roof and rear façades; alterations to skylights and access doors to terraces; alterations to Portman Mews and Orchard Street elevations and to main entrance; alterations to louvres and to internal layout.
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Progress
Application details
- Reference
- 26/02687/NMA
- Local authority
- Westminster
- Postcode
- W1H 6LY
- Ward
- WEW_22
- Application type
- All Other
- Property type
- Commercial
Key dates
- Submitted
- 22 Apr 2026
- Validated
- 22 Apr 2026
- Target decision
- 20 May 2026
- Decided
- 15 May 2026
Estimated project value
£37k–£100k
Typical UK cost for this job type, at inner London rates (2026). Estimated from the proposal description — planning applications do not state build cost. Source: Checkatrade 2026 loft conversion cost guide.
Recently sold nearby
New owners, recently moved in. First work on a house usually follows within months of completing. 8 recent sales are listed below.
- FLAT 8, CRANFIELD COURT HOMER STREET, LONDON, W1H 4NBFlat or maisonette · Leasehold · £485,0002 months ago19 Jun 2026
- 18 BRYANSTON MEWS WEST, LONDON, W1H 2DDFlat or maisonette · Leasehold · £1,825,0002 months ago17 Jun 2026
- FLAT D, 30 UPPER MONTAGU STREET, LONDON, W1H 1RPFlat or maisonette · Leasehold · £860,0003 months ago9 Jun 2026
- BASEMENT FLAT, 13 WYNDHAM PLACE, LONDON, W1H 2PYFlat or maisonette · Leasehold · £805,0003 months ago5 Jun 2026
- FLAT 32, CRANFIELD COURT HOMER STREET, LONDON, W1H 4NFFlat or maisonette · Leasehold · Not a standard market sale · £350,0004 months ago8 May 2026
- FLAT 6, 14 - 15 MOLYNEUX STREET, LONDON, W1H 5HQFlat or maisonette · Leasehold · £570,0004 months ago8 May 2026
- 7 TARRANT PLACE, LONDON, W1H 1ADTerraced · Leasehold · £1,550,0004 months ago29 Apr 2026
- 2, 114 SEYMOUR PLACE, LONDON, W1H 1NNFlat or maisonette · Leasehold · £375,0005 months ago27 Mar 2026
Homes here go for about £805,000 — the median of the last 7 market sales in W1H (the wider postcode district), £375,000 to £1,825,000.
Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.
Planning constraints
No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.
Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.
Nearby applications
- 43, 45 Portman Square Westminster W1H 6LYPermittedNext door
- 43, 45 Portman Square Westminster W1H 6LYPermittedNext door
- 43, 45 Portman Square Westminster W1H 6LYPermittedNext door
- 43, 45 Portman Square Westminster W1H 6LYRefusedNext door
- 43, 45 43-45 Portman Square Westminster W1H 6LYPermittedNext door
- 43, 45 Portman Square Westminster W1H 6LYPermittedNext door